A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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Scatter Radiation. Primary - The beam of photons that exit the x-ray tube and hit the patient's body , the amount of photons lessens as they pass through matter. Remnant- the resulting beam that exits from the patient. SCATTER- photons that interact with the body's matter and travel in a different direction.